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Abstract

The project of Refurbishment of Fuji 11kV Panels was requested by Hong Kong China Light & Power Co.,Ltd (CLP). The project was expected to extend the service life of existing Fuji panels and improve the internal arc fault capability to 20kA 1 sec. The replacement of circuit breaker door is a must. The original Fuji panel was not designed to withstand the internal arc fault, first internal arc fault test failed in XIHARI.
Analysis: The defect of the Fuji panel (the lock of the CB door is too weak, the width of the panel is narrow than the Unigear-ZS1 panel). The normal CB door cannot withstand the high pressure caused by the internal arc.
The new type of arc proof CB door change the normal locking system. The worm wheel system is applied to drive the locking bar to lock the CB door all around the panel frame. The U shape sealing plate and sealing rubber is applied to prevent the leakage of internal arc and high temperature pressure .
The interlocking system is also applied on the CB door to prevent the wrong operation to protect the operator

Country

China

Language

English (United States)

This text was extracted from a PDF file.

This is the abbreviated version, containing approximately
55% of the total text.

A New Type of Arc-proof Circuit breaker Door

1. Background
1) Cause: The project of Refurbishment of Fuji 11kV Panels was requested by
Hong Kong China Light & Power Co.,Ltd (CLP). The project was expected to
extend the service life of existing Fuji panels and improve the internal arc fault
capability to 20kA 1 sec. The replacement of circuit breaker door is a must. The
original Fuji panel was not designed to withstand the internal arc fault, first
internal arc fault test failed in XIHARI. (Fig.1)

Fig.1 XIHARI Internal Arc Fault test failed

The CB door was
pushed out by the
high pressure caused
by the internal arc.
The circuit breaker
was pushed out of the
panel.

2) Analysis: The defect of the Fuji panel (the lock of the CB door is too weak, the width
of the panel is narrow than the Unigear-ZS1 panel). The normal CB door cannot
withstand the high pressure caused by the internal arc.

Fig.2 Fuji panel Fig.3 ABB Unigear-ZS1 panel

3) The new type of arc proof CB door change the normal locking system. The
worm wheel system is applied to drive the locking bar to lock the CB door all
around the panel frame. The U shape sealing plate and sealing rubber is applied
to prevent the leakage of internal arc and high temperature pressure. The
interlocking system is also applied on the CB door to prevent the wrong operation
to protect the operator.